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Y2-y1 x2-x1
take two ordered pairs. then do difference of y's divided by difference of x's and that is your slope
Y is the second number in a set of ordered pairs.
Point Slope form is important because it can give us another set of coordinate pairs when we are only given one. When you have the two coordinate pairs, we are able to find the slope of the line using Y2-Y1 ------- X2-X1 Note: The slope is used to find how much y changes(increase/decreases) when x increases by one.
If you are talking about the things in the perentheses, (5,-9), they are called ordered pairs. Ordered pairs help you find a location on a coordinate graph.